package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingChartMapper;
import com.sky.mapper.dishMapper;
import com.sky.service.SetmealService;
import com.sky.service.ShoppingChartSrevice;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingChartServicelmpl implements ShoppingChartSrevice {
    @Autowired
    private ShoppingChartMapper shoppingChartMapper;
    @Autowired
    private dishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingChart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车中的商品是否已经存在
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

       List<ShoppingCart> list=shoppingChartMapper.list(shoppingCart);
        //如果存在，只需要将数量加1
        if(list!=null && list.size()>0){
            ShoppingCart cart = list.get(0);   //拿到存在的那条数据
            cart.setNumber(cart.getNumber()+1);
            shoppingChartMapper.updateNumberById(cart);
        }else {
            //如果不存在，需要插入一条购物车数据

            //判断本次添加到购物车的是菜品黑色套餐
          Long dishId =  shoppingCartDTO.getDishId();
          if(dishId!=null){
              //添加的是菜品
             Dish dish= dishMapper.getDishId(dishId);
             shoppingCart.setName(dish.getName());
             shoppingCart.setImage(dish.getImage());
             shoppingCart.setAmount(dish.getPrice());

             //shoppingChartMapper.insert(shoppingCart);
          }else {
              //添加的是套餐
            Long setmealId=  shoppingCartDTO.getSetmealId();
             Setmeal setmeal= setmealMapper.getById(setmealId);
             shoppingCart.setName(setmeal.getName());
             shoppingCart.setImage(setmeal.getImage());
             shoppingCart.setAmount(setmeal.getPrice());

             //shoppingChartMapper.insert(shoppingCart);
          }
          shoppingCart.setNumber(1);
          shoppingCart.setCreateTime(LocalDateTime.now());
          shoppingChartMapper.insert(shoppingCart);

        }

    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
       Long userId= BaseContext.getCurrentId(); //获取当前微信用户的id
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        return shoppingChartMapper.list(shoppingCart);
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userId= BaseContext.getCurrentId(); //获取当前微信用户的id
        shoppingChartMapper.cleanShoppingChart(userId);

    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void deleteShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingChartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);// 获取第一条记录

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingChartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingChartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}

